program Loop(input, output);
var a, number, sum: integer;
big, small, step: integer;
begin
   big := 10;
   step := -2;
   number := big;
   sum := 0;
   while number > big do
   begin
      sum := sum + number;
      number := number + step
   end;
   writeln(sum);
   write(sum)
end.